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Date: Sat, 5 Mar 2011 11:22:45 +0000 (UTC)
From: "Filipe Manana (JIRA)" <jira@apache.org>
To: dev@couchdb.apache.org
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Subject: [jira] Resolved: (COUCHDB-1080) fail fast with checkpoint conflicts
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     [ https://issues.apache.org/jira/browse/COUCHDB-1080?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Filipe Manana resolved COUCHDB-1080.
------------------------------------

       Resolution: Fixed
    Fix Version/s:     (was: 1.1)
         Assignee: Filipe Manana

Applied to trunk. Thanks.

> fail fast with checkpoint conflicts
> -----------------------------------
>
>                 Key: COUCHDB-1080
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1080
>             Project: CouchDB
>          Issue Type: Improvement
>          Components: Replication
>    Affects Versions: 1.0.2
>            Reporter: Randall Leeds
>            Assignee: Filipe Manana
>             Fix For: 1.2
>
>         Attachments: COUCHDB-1080-2-fdmanana.patch, COUCHDB-1080-3-fdmanana.patch, COUCHDB-1080-4-fdmanana.patch, COUCHDB-1080-fdmanana.patch, paranoid_checkpoint_failure.patch, paranoid_checkpoint_failure_v2.patch
>
>
> I've thought about this long and hard and probably should have submitted the bug a long time ago. I've also run this in production for months.
> When a checkpoint conflict occurs it is almost always the right thing to do to abort.
> If there is a rev mismatch it could mean there's are two conflicting (continuous and one-shot) replications between the same hosts running. Without reloading the history documents checkpoints will continue to fail forever. This could leave us in a state with many replicated changes but no checkpoints.
> Similarly, a successful checkpoint but a lost/timed-out response could cause this situation.
> Since the supervisor will restart the replication anyway, I think it's safer to abort and retry.

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